Process of preparing styrenated diphenylamine

Abstract

Styrenated diphenylamine is prepared by reacting styrene with diphenylamine in the presence of undried acidic clay catalyst.

What I claim is: 
     
       1. In a process for the preparation of styrenated diphenylamine comprising reacting a combination comprising (a) diphenylamine and (b) styrene in the presence of a catalytic amount of an undried acid clay catalyst containing a major amount of aluminum hydrosilicate at a reaction temperature of from 190° to 220° C. wherein the level of styrene is from 1.95 to 2.15 mols per mol of diphenylamine, the improvement characterized in that the undried acid clay catalyst contains 6 to 9 percent water. 
     
     
       2. A process according to claim 1 wherein the reaction temperature is from 200° C. to 208° C. and the level of styrene is from 2.00 to 2.05 mols per mol of diphenylamine.